src/vnet/ip/ip4_forward.h

   1 /*
   2  * Copyright (c) 2015 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 /*
  16  * ip/ip4_forward.h: IP v4 forwarding
  17  *
  18  * Copyright (c) 2008 Eliot Dresselhaus
  19  *
  20  * Permission is hereby granted, free of charge, to any person obtaining
  21  * a copy of this software and associated documentation files (the
  22  * "Software"), to deal in the Software without restriction, including
  23  * without limitation the rights to use, copy, modify, merge, publish,
  24  * distribute, sublicense, and/or sell copies of the Software, and to
  25  * permit persons to whom the Software is furnished to do so, subject to
  26  * the following conditions:
  27  *
  28  * The above copyright notice and this permission notice shall be
  29  * included in all copies or substantial portions of the Software.
  30  *
  31  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  32  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  33  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  34  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  35  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  36  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  37  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  38  */
  39
  40 #ifndef __included_ip4_forward_h__
  41 #define __included_ip4_forward_h__
  42
  43 #include <vppinfra/cache.h>
  44 #include <vnet/fib/ip4_fib.h>
  45 #include <vnet/dpo/load_balance_map.h>
  46
  47 /**
  48  * @file
  49  * @brief IPv4 Forwarding.
  50  *
  51  * This file contains the source code for IPv4 forwarding.
  52  */
  53
  54 always_inline uword
  55 ip4_lookup_inline (vlib_main_t * vm,
  56                    vlib_node_runtime_t * node,
  57                    vlib_frame_t * frame,
  58                    int lookup_for_responses_to_locally_received_packets)
  59 {
  60   ip4_main_t *im = &ip4_main;
  61   vlib_combined_counter_main_t *cm = &load_balance_main.lbm_to_counters;
  62   u32 n_left_from, n_left_to_next, *from, *to_next;
  63   ip_lookup_next_t next;
  64   u32 thread_index = vm->thread_index;
  65
  66   from = vlib_frame_vector_args (frame);
  67   n_left_from = frame->n_vectors;
  68   next = node->cached_next_index;
  69
  70   while (n_left_from > 0)
  71     {
  72       vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
  73
  74 #if (CLIB_N_PREFETCHES >= 8)
  75       while (n_left_from >= 8 && n_left_to_next >= 4)
  76         {
  77           vlib_buffer_t *p0, *p1, *p2, *p3;
  78           ip4_header_t *ip0, *ip1, *ip2, *ip3;
  79           ip_lookup_next_t next0, next1, next2, next3;
  80           const load_balance_t *lb0, *lb1, *lb2, *lb3;
  81           ip4_fib_mtrie_t *mtrie0, *mtrie1, *mtrie2, *mtrie3;
  82           ip4_fib_mtrie_leaf_t leaf0, leaf1, leaf2, leaf3;
  83           ip4_address_t *dst_addr0, *dst_addr1, *dst_addr2, *dst_addr3;
  84           u32 pi0, pi1, pi2, pi3, lb_index0, lb_index1, lb_index2, lb_index3;
  85           flow_hash_config_t flow_hash_config0, flow_hash_config1;
  86           flow_hash_config_t flow_hash_config2, flow_hash_config3;
  87           u32 hash_c0, hash_c1, hash_c2, hash_c3;
  88           const dpo_id_t *dpo0, *dpo1, *dpo2, *dpo3;
  89
  90           /* Prefetch next iteration. */
  91           {
  92             vlib_buffer_t *p4, *p5, *p6, *p7;
  93
  94             p4 = vlib_get_buffer (vm, from[4]);
  95             p5 = vlib_get_buffer (vm, from[5]);
  96             p6 = vlib_get_buffer (vm, from[6]);
  97             p7 = vlib_get_buffer (vm, from[7]);
  98
  99             vlib_prefetch_buffer_header (p4, LOAD);
 100             vlib_prefetch_buffer_header (p5, LOAD);
 101             vlib_prefetch_buffer_header (p6, LOAD);
 102             vlib_prefetch_buffer_header (p7, LOAD);
 103
 104             CLIB_PREFETCH (p4->data, sizeof (ip0[0]), LOAD);
 105             CLIB_PREFETCH (p5->data, sizeof (ip0[0]), LOAD);
 106             CLIB_PREFETCH (p6->data, sizeof (ip0[0]), LOAD);
 107             CLIB_PREFETCH (p7->data, sizeof (ip0[0]), LOAD);
 108           }
 109
 110           pi0 = to_next[0] = from[0];
 111           pi1 = to_next[1] = from[1];
 112           pi2 = to_next[2] = from[2];
 113           pi3 = to_next[3] = from[3];
 114
 115           from += 4;
 116           to_next += 4;
 117           n_left_to_next -= 4;
 118           n_left_from -= 4;
 119
 120           p0 = vlib_get_buffer (vm, pi0);
 121           p1 = vlib_get_buffer (vm, pi1);
 122           p2 = vlib_get_buffer (vm, pi2);
 123           p3 = vlib_get_buffer (vm, pi3);
 124
 125           ip0 = vlib_buffer_get_current (p0);
 126           ip1 = vlib_buffer_get_current (p1);
 127           ip2 = vlib_buffer_get_current (p2);
 128           ip3 = vlib_buffer_get_current (p3);
 129
 130           dst_addr0 = &ip0->dst_address;
 131           dst_addr1 = &ip1->dst_address;
 132           dst_addr2 = &ip2->dst_address;
 133           dst_addr3 = &ip3->dst_address;
 134
 135           ip_lookup_set_buffer_fib_index (im->fib_index_by_sw_if_index, p0);
 136           ip_lookup_set_buffer_fib_index (im->fib_index_by_sw_if_index, p1);
 137           ip_lookup_set_buffer_fib_index (im->fib_index_by_sw_if_index, p2);
 138           ip_lookup_set_buffer_fib_index (im->fib_index_by_sw_if_index, p3);
 139
 140           if (!lookup_for_responses_to_locally_received_packets)
 141             {
 142               mtrie0 = &ip4_fib_get (vnet_buffer (p0)->ip.fib_index)->mtrie;
 143               mtrie1 = &ip4_fib_get (vnet_buffer (p1)->ip.fib_index)->mtrie;
 144               mtrie2 = &ip4_fib_get (vnet_buffer (p2)->ip.fib_index)->mtrie;
 145               mtrie3 = &ip4_fib_get (vnet_buffer (p3)->ip.fib_index)->mtrie;
 146
 147               leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, dst_addr0);
 148               leaf1 = ip4_fib_mtrie_lookup_step_one (mtrie1, dst_addr1);
 149               leaf2 = ip4_fib_mtrie_lookup_step_one (mtrie2, dst_addr2);
 150               leaf3 = ip4_fib_mtrie_lookup_step_one (mtrie3, dst_addr3);
 151             }
 152
 153           if (!lookup_for_responses_to_locally_received_packets)
 154             {
 155               leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
 156               leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 2);
 157               leaf2 = ip4_fib_mtrie_lookup_step (mtrie2, leaf2, dst_addr2, 2);
 158               leaf3 = ip4_fib_mtrie_lookup_step (mtrie3, leaf3, dst_addr3, 2);
 159             }
 160
 161           if (!lookup_for_responses_to_locally_received_packets)
 162             {
 163               leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 3);
 164               leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 3);
 165               leaf2 = ip4_fib_mtrie_lookup_step (mtrie2, leaf2, dst_addr2, 3);
 166               leaf3 = ip4_fib_mtrie_lookup_step (mtrie3, leaf3, dst_addr3, 3);
 167             }
 168
 169           if (lookup_for_responses_to_locally_received_packets)
 170             {
 171               lb_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
 172               lb_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_RX];
 173               lb_index2 = vnet_buffer (p2)->ip.adj_index[VLIB_RX];
 174               lb_index3 = vnet_buffer (p3)->ip.adj_index[VLIB_RX];
 175             }
 176           else
 177             {
 178               lb_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
 179               lb_index1 = ip4_fib_mtrie_leaf_get_adj_index (leaf1);
 180               lb_index2 = ip4_fib_mtrie_leaf_get_adj_index (leaf2);
 181               lb_index3 = ip4_fib_mtrie_leaf_get_adj_index (leaf3);
 182             }
 183
 184           ASSERT (lb_index0 && lb_index1 && lb_index2 && lb_index3);
 185           lb0 = load_balance_get (lb_index0);
 186           lb1 = load_balance_get (lb_index1);
 187           lb2 = load_balance_get (lb_index2);
 188           lb3 = load_balance_get (lb_index3);
 189
 190           ASSERT (lb0->lb_n_buckets > 0);
 191           ASSERT (is_pow2 (lb0->lb_n_buckets));
 192           ASSERT (lb1->lb_n_buckets > 0);
 193           ASSERT (is_pow2 (lb1->lb_n_buckets));
 194           ASSERT (lb2->lb_n_buckets > 0);
 195           ASSERT (is_pow2 (lb2->lb_n_buckets));
 196           ASSERT (lb3->lb_n_buckets > 0);
 197           ASSERT (is_pow2 (lb3->lb_n_buckets));
 198
 199           /* Use flow hash to compute multipath adjacency. */
 200           hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
 201           hash_c1 = vnet_buffer (p1)->ip.flow_hash = 0;
 202           hash_c2 = vnet_buffer (p2)->ip.flow_hash = 0;
 203           hash_c3 = vnet_buffer (p3)->ip.flow_hash = 0;
 204           if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 205             {
 206               flow_hash_config0 = lb0->lb_hash_config;
 207               hash_c0 = vnet_buffer (p0)->ip.flow_hash =
 208                 ip4_compute_flow_hash (ip0, flow_hash_config0);
 209               dpo0 =
 210                 load_balance_get_fwd_bucket (lb0,
 211                                              (hash_c0 &
 212                                               (lb0->lb_n_buckets_minus_1)));
 213             }
 214           else
 215             {
 216               dpo0 = load_balance_get_bucket_i (lb0, 0);
 217             }
 218           if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
 219             {
 220               flow_hash_config1 = lb1->lb_hash_config;
 221               hash_c1 = vnet_buffer (p1)->ip.flow_hash =
 222                 ip4_compute_flow_hash (ip1, flow_hash_config1);
 223               dpo1 =
 224                 load_balance_get_fwd_bucket (lb1,
 225                                              (hash_c1 &
 226                                               (lb1->lb_n_buckets_minus_1)));
 227             }
 228           else
 229             {
 230               dpo1 = load_balance_get_bucket_i (lb1, 0);
 231             }
 232           if (PREDICT_FALSE (lb2->lb_n_buckets > 1))
 233             {
 234               flow_hash_config2 = lb2->lb_hash_config;
 235               hash_c2 = vnet_buffer (p2)->ip.flow_hash =
 236                 ip4_compute_flow_hash (ip2, flow_hash_config2);
 237               dpo2 =
 238                 load_balance_get_fwd_bucket (lb2,
 239                                              (hash_c2 &
 240                                               (lb2->lb_n_buckets_minus_1)));
 241             }
 242           else
 243             {
 244               dpo2 = load_balance_get_bucket_i (lb2, 0);
 245             }
 246           if (PREDICT_FALSE (lb3->lb_n_buckets > 1))
 247             {
 248               flow_hash_config3 = lb3->lb_hash_config;
 249               hash_c3 = vnet_buffer (p3)->ip.flow_hash =
 250                 ip4_compute_flow_hash (ip3, flow_hash_config3);
 251               dpo3 =
 252                 load_balance_get_fwd_bucket (lb3,
 253                                              (hash_c3 &
 254                                               (lb3->lb_n_buckets_minus_1)));
 255             }
 256           else
 257             {
 258               dpo3 = load_balance_get_bucket_i (lb3, 0);
 259             }
 260
 261           next0 = dpo0->dpoi_next_node;
 262           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 263           next1 = dpo1->dpoi_next_node;
 264           vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
 265           next2 = dpo2->dpoi_next_node;
 266           vnet_buffer (p2)->ip.adj_index[VLIB_TX] = dpo2->dpoi_index;
 267           next3 = dpo3->dpoi_next_node;
 268           vnet_buffer (p3)->ip.adj_index[VLIB_TX] = dpo3->dpoi_index;
 269
 270           vlib_increment_combined_counter
 271             (cm, thread_index, lb_index0, 1,
 272              vlib_buffer_length_in_chain (vm, p0));
 273           vlib_increment_combined_counter
 274             (cm, thread_index, lb_index1, 1,
 275              vlib_buffer_length_in_chain (vm, p1));
 276           vlib_increment_combined_counter
 277             (cm, thread_index, lb_index2, 1,
 278              vlib_buffer_length_in_chain (vm, p2));
 279           vlib_increment_combined_counter
 280             (cm, thread_index, lb_index3, 1,
 281              vlib_buffer_length_in_chain (vm, p3));
 282
 283           vlib_validate_buffer_enqueue_x4 (vm, node, next,
 284                                            to_next, n_left_to_next,
 285                                            pi0, pi1, pi2, pi3,
 286                                            next0, next1, next2, next3);
 287         }
 288 #elif (CLIB_N_PREFETCHES >= 4)
 289       while (n_left_from >= 4 && n_left_to_next >= 2)
 290         {
 291           vlib_buffer_t *p0, *p1;
 292           ip4_header_t *ip0, *ip1;
 293           ip_lookup_next_t next0, next1;
 294           const load_balance_t *lb0, *lb1;
 295           ip4_fib_mtrie_t *mtrie0, *mtrie1;
 296           ip4_fib_mtrie_leaf_t leaf0, leaf1;
 297           ip4_address_t *dst_addr0, *dst_addr1;
 298           u32 pi0, pi1, lb_index0, lb_index1;
 299           flow_hash_config_t flow_hash_config0, flow_hash_config1;
 300           u32 hash_c0, hash_c1;
 301           const dpo_id_t *dpo0, *dpo1;
 302
 303           /* Prefetch next iteration. */
 304           {
 305             vlib_buffer_t *p2, *p3;
 306
 307             p2 = vlib_get_buffer (vm, from[2]);
 308             p3 = vlib_get_buffer (vm, from[3]);
 309
 310             vlib_prefetch_buffer_header (p2, LOAD);
 311             vlib_prefetch_buffer_header (p3, LOAD);
 312
 313             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), LOAD);
 314             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), LOAD);
 315           }
 316
 317           pi0 = to_next[0] = from[0];
 318           pi1 = to_next[1] = from[1];
 319
 320           from += 2;
 321           to_next += 2;
 322           n_left_to_next -= 2;
 323           n_left_from -= 2;
 324
 325           p0 = vlib_get_buffer (vm, pi0);
 326           p1 = vlib_get_buffer (vm, pi1);
 327
 328           ip0 = vlib_buffer_get_current (p0);
 329           ip1 = vlib_buffer_get_current (p1);
 330
 331           dst_addr0 = &ip0->dst_address;
 332           dst_addr1 = &ip1->dst_address;
 333
 334           ip_lookup_set_buffer_fib_index (im->fib_index_by_sw_if_index, p0);
 335           ip_lookup_set_buffer_fib_index (im->fib_index_by_sw_if_index, p1);
 336
 337           if (!lookup_for_responses_to_locally_received_packets)
 338             {
 339               mtrie0 = &ip4_fib_get (vnet_buffer (p0)->ip.fib_index)->mtrie;
 340               mtrie1 = &ip4_fib_get (vnet_buffer (p1)->ip.fib_index)->mtrie;
 341
 342               leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, dst_addr0);
 343               leaf1 = ip4_fib_mtrie_lookup_step_one (mtrie1, dst_addr1);
 344             }
 345
 346           if (!lookup_for_responses_to_locally_received_packets)
 347             {
 348               leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
 349               leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 2);
 350             }
 351
 352           if (!lookup_for_responses_to_locally_received_packets)
 353             {
 354               leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 3);
 355               leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 3);
 356             }
 357
 358           if (lookup_for_responses_to_locally_received_packets)
 359             {
 360               lb_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
 361               lb_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_RX];
 362             }
 363           else
 364             {
 365               lb_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
 366               lb_index1 = ip4_fib_mtrie_leaf_get_adj_index (leaf1);
 367             }
 368
 369           ASSERT (lb_index0 && lb_index1);
 370           lb0 = load_balance_get (lb_index0);
 371           lb1 = load_balance_get (lb_index1);
 372
 373           ASSERT (lb0->lb_n_buckets > 0);
 374           ASSERT (is_pow2 (lb0->lb_n_buckets));
 375           ASSERT (lb1->lb_n_buckets > 0);
 376           ASSERT (is_pow2 (lb1->lb_n_buckets));
 377
 378           /* Use flow hash to compute multipath adjacency. */
 379           hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
 380           hash_c1 = vnet_buffer (p1)->ip.flow_hash = 0;
 381           if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 382             {
 383               flow_hash_config0 = lb0->lb_hash_config;
 384               hash_c0 = vnet_buffer (p0)->ip.flow_hash =
 385                 ip4_compute_flow_hash (ip0, flow_hash_config0);
 386               dpo0 =
 387                 load_balance_get_fwd_bucket (lb0,
 388                                              (hash_c0 &
 389                                               (lb0->lb_n_buckets_minus_1)));
 390             }
 391           else
 392             {
 393               dpo0 = load_balance_get_bucket_i (lb0, 0);
 394             }
 395           if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
 396             {
 397               flow_hash_config1 = lb1->lb_hash_config;
 398               hash_c1 = vnet_buffer (p1)->ip.flow_hash =
 399                 ip4_compute_flow_hash (ip1, flow_hash_config1);
 400               dpo1 =
 401                 load_balance_get_fwd_bucket (lb1,
 402                                              (hash_c1 &
 403                                               (lb1->lb_n_buckets_minus_1)));
 404             }
 405           else
 406             {
 407               dpo1 = load_balance_get_bucket_i (lb1, 0);
 408             }
 409
 410           next0 = dpo0->dpoi_next_node;
 411           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 412           next1 = dpo1->dpoi_next_node;
 413           vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
 414
 415           vlib_increment_combined_counter
 416             (cm, thread_index, lb_index0, 1,
 417              vlib_buffer_length_in_chain (vm, p0));
 418           vlib_increment_combined_counter
 419             (cm, thread_index, lb_index1, 1,
 420              vlib_buffer_length_in_chain (vm, p1));
 421
 422           vlib_validate_buffer_enqueue_x2 (vm, node, next,
 423                                            to_next, n_left_to_next,
 424                                            pi0, pi1, next0, next1);
 425         }
 426 #endif
 427       while (n_left_from > 0 && n_left_to_next > 0)
 428         {
 429           vlib_buffer_t *p0;
 430           ip4_header_t *ip0;
 431           ip_lookup_next_t next0;
 432           const load_balance_t *lb0;
 433           ip4_fib_mtrie_t *mtrie0;
 434           ip4_fib_mtrie_leaf_t leaf0;
 435           ip4_address_t *dst_addr0;
 436           u32 pi0, lbi0;
 437           flow_hash_config_t flow_hash_config0;
 438           const dpo_id_t *dpo0;
 439           u32 hash_c0;
 440
 441           pi0 = from[0];
 442           to_next[0] = pi0;
 443
 444           p0 = vlib_get_buffer (vm, pi0);
 445           ip0 = vlib_buffer_get_current (p0);
 446           dst_addr0 = &ip0->dst_address;
 447           ip_lookup_set_buffer_fib_index (im->fib_index_by_sw_if_index, p0);
 448
 449           if (!lookup_for_responses_to_locally_received_packets)
 450             {
 451               mtrie0 = &ip4_fib_get (vnet_buffer (p0)->ip.fib_index)->mtrie;
 452               leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, dst_addr0);
 453             }
 454
 455           if (!lookup_for_responses_to_locally_received_packets)
 456             leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
 457
 458           if (!lookup_for_responses_to_locally_received_packets)
 459             leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 3);
 460
 461           if (lookup_for_responses_to_locally_received_packets)
 462             lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
 463           else
 464             {
 465               /* Handle default route. */
 466               lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
 467             }
 468
 469           ASSERT (lbi0);
 470           lb0 = load_balance_get (lbi0);
 471
 472           ASSERT (lb0->lb_n_buckets > 0);
 473           ASSERT (is_pow2 (lb0->lb_n_buckets));
 474
 475           /* Use flow hash to compute multipath adjacency. */
 476           hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
 477           if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
 478             {
 479               flow_hash_config0 = lb0->lb_hash_config;
 480
 481               hash_c0 = vnet_buffer (p0)->ip.flow_hash =
 482                 ip4_compute_flow_hash (ip0, flow_hash_config0);
 483               dpo0 =
 484                 load_balance_get_fwd_bucket (lb0,
 485                                              (hash_c0 &
 486                                               (lb0->lb_n_buckets_minus_1)));
 487             }
 488           else
 489             {
 490               dpo0 = load_balance_get_bucket_i (lb0, 0);
 491             }
 492
 493           next0 = dpo0->dpoi_next_node;
 494           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 495
 496           vlib_increment_combined_counter (cm, thread_index, lbi0, 1,
 497                                            vlib_buffer_length_in_chain (vm,
 498                                                                         p0));
 499
 500           from += 1;
 501           to_next += 1;
 502           n_left_to_next -= 1;
 503           n_left_from -= 1;
 504
 505           if (PREDICT_FALSE (next0 != next))
 506             {
 507               n_left_to_next += 1;
 508               vlib_put_next_frame (vm, node, next, n_left_to_next);
 509               next = next0;
 510               vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
 511               to_next[0] = pi0;
 512               to_next += 1;
 513               n_left_to_next -= 1;
 514             }
 515         }
 516
 517       vlib_put_next_frame (vm, node, next, n_left_to_next);
 518     }
 519
 520   if (node->flags & VLIB_NODE_FLAG_TRACE)
 521     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
 522
 523   return frame->n_vectors;
 524 }
 525
 526 #endif /* __included_ip4_forward_h__ */
 527
 528 /*
 529  * fd.io coding-style-patch-verification: ON
 530  *
 531  * Local Variables:
 532  * eval: (c-set-style "gnu")
 533  * End:
 534  */